| clean | (adjective) free from dirt or impurities; or having clean habits | - |
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| (adjective) (of behavior or especially language) free from objectionable elements; fit for all observers | Synonyms: unobjectionable |
| (adjective) not spreading pollution or contamination; especially radioactive contamination | Synonyms: uncontaminating |
| (adjective) ritually clean or pure | - |
| (adjective) free from clumsiness; precisely or deftly executed | Synonyms: neat |
| (adjective) free from sepsis or infection | Synonyms: uninfected |
| (adjective) thorough and without qualification | - |
| (adjective) without difficulties or problems | - |
| (adjective) (of a surface) not written or printed on | Synonyms: blank, white |
| (adjective) exhibiting or calling for sportsmanship or fair play | Synonyms: sporting, sportsmanlike, sporty |
| (adjective) (of a manuscript) having few alterations or corrections | Synonyms: fair |
| (adjective) morally pure | Synonyms: clean-living |
| (adjective) (of a record) having no marks of discredit or offense | - |
| (adjective) free from impurities | Synonyms: fresh |
| (adjective) free of drugs | - |
| (adjective) not carrying concealed weapons | - |
| (adjective) free of restrictions or qualifications | Synonyms: clear |
| (adjective) (of sound or color) free from anything that dulls or dims | Synonyms: clear, light, unclouded |
| cleanable | (adjective) capable of being cleaned | - |
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| cleanly | (adjective) habitually clean | - |
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| cleansing | (adjective) acting like an antiseptic | Synonyms: purifying |
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| (adjective) cleansing the body by washing; especially ritual washing of e.g. hands | Synonyms: ablutionary |
| clear | (adjective) readily apparent to the mind | - |
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| (adjective) allowing light to pass through | - |
| (adjective) free from clouds or mist or haze | - |
| (adjective) accurately stated or described | Synonyms: well-defined |
| (adjective) free from confusion or doubt | - |
| (adjective) characterized by ease and quickness in perceiving | Synonyms: percipient |
| (adjective) clear and distinct to the senses; easily perceptible | Synonyms: clean-cut, clear-cut |
| (adjective) freed from any question of guilt | Synonyms: absolved, cleared, exculpated, exonerated, vindicated |
| (adjective) easily deciphered | Synonyms: decipherable, readable |
| (adjective) clear of charges or deductions | - |
| (adjective) free from flaw or blemish or impurity | - |
| (adjective) (especially of a title) free from any encumbrance or limitation that presents a question of fact or law | Synonyms: unmortgaged |
| (adjective) affording free passage or view | Synonyms: open |
| (adjective) free of restrictions or qualifications | Synonyms: clean |
| (adjective) characterized by freedom from troubling thoughts (especially guilt) | - |
| (adjective) (of sound or color) free from anything that dulls or dims | Synonyms: clean, light, unclouded |
| (adjective) free from contact or proximity or connection | - |
| cleared | (adjective) rid of objects or obstructions such as e.g. trees and brush | - |
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| (adjective) freed from any question of guilt | Synonyms: absolved, clear, exculpated, exonerated, vindicated |
| clearheaded | (adjective) not mentally confused; able to think clearly and act intelligently | Synonyms: clear-thinking |
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| cleavable | (adjective) capable of being cleaved | - |
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| cleft | (adjective) having one or more indentations reaching nearly to the midrib | Synonyms: dissected |
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| (adjective) split or divided | - |
| cleistogamic | (adjective) exhibiting or relating to cleistogamy | Synonyms: cleistogamous |
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| cleistogamous | (adjective) exhibiting or relating to cleistogamy | Synonyms: cleistogamic |
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| clement | (adjective) (used of persons or behavior) inclined to show mercy | - |
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| (adjective) (of weather or climate) physically mild | - |
| clenched | (adjective) closed or squeezed together tightly | Synonyms: clinched |
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| clerical | (adjective) of or relating to the clergy | - |
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| (adjective) of or relating to clerks | - |
| (adjective) appropriate for or engaged in office work | - |
| clever | (adjective) showing inventiveness and skill | Synonyms: cunning, ingenious |
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| (adjective) mentally quick and resourceful | Synonyms: apt |
| (adjective) showing self-interest and shrewdness in dealing with others | Synonyms: cagey, cagy, canny |